KVM: nVMX: Expose load IA32_PERF_GLOBAL_CTRL VM-{Entry,Exit} control

The "load IA32_PERF_GLOBAL_CTRL" bit for VM-entry and VM-exit should
only be exposed to the guest if IA32_PERF_GLOBAL_CTRL is a valid MSR.
Create a new helper to allow pmu_refresh() to update the VM-Entry and
VM-Exit controls to ensure PMU values are initialized when performing
the is_valid_msr() check.

Suggested-by: Jim Mattson <[email protected]>
Co-developed-by: Krish Sadhukhan <[email protected]>
Signed-off-by: Krish Sadhukhan <[email protected]>
Signed-off-by: Oliver Upton <[email protected]>
Reviewed-by: Jim Mattson <[email protected]>
Reviewed-by: Peter Shier <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

Author: oupton

arch/x86/kvm/vmx/nested.c

@@ -4359,6 +4359,27 @@ int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
 	return 0;
 }
 
+void nested_vmx_pmu_entry_exit_ctls_update(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_vmx *vmx;
+
+	if (!nested_vmx_allowed(vcpu))
+		return;
+
+	vmx = to_vmx(vcpu);
+	if (kvm_x86_ops->pmu_ops->is_valid_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL)) {
+		vmx->nested.msrs.entry_ctls_high |=
+				VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
+		vmx->nested.msrs.exit_ctls_high |=
+				VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
+	} else {
+		vmx->nested.msrs.entry_ctls_high &=
+				~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
+		vmx->nested.msrs.exit_ctls_high &=
+				~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
+	}
+}
+
 static int nested_vmx_get_vmptr(struct kvm_vcpu *vcpu, gpa_t *vmpointer)
 {
 	gva_t gva;

arch/x86/kvm/vmx/nested.h

@@ -22,6 +22,7 @@ int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 int vmx_get_vmx_msr(struct nested_vmx_msrs *msrs, u32 msr_index, u64 *pdata);
 int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
 			u32 vmx_instruction_info, bool wr, int len, gva_t *ret);
+void nested_vmx_pmu_entry_exit_ctls_update(struct kvm_vcpu *vcpu);
 
 static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu)
 {

arch/x86/kvm/vmx/pmu_intel.c

@@ -15,6 +15,7 @@
 #include "x86.h"
 #include "cpuid.h"
 #include "lapic.h"
+#include "nested.h"
 #include "pmu.h"
 
 static struct kvm_event_hw_type_mapping intel_arch_events[] = {
@@ -335,6 +336,8 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
 		0, pmu->nr_arch_gp_counters);
 	bitmap_set(pmu->all_valid_pmc_idx,
 		INTEL_PMC_MAX_GENERIC, pmu->nr_arch_fixed_counters);
+
+	nested_vmx_pmu_entry_exit_ctls_update(vcpu);
 }
 
 static void intel_pmu_init(struct kvm_vcpu *vcpu)